The NET of the LXX translates ἐνισχυσάτωσαν as "prevail." Is this because it would seem irreverent to think of "strengthening" God or is there some other factor involved that I am overlooking?

Deuteronomy 32:43 - NET
"43 Be glad, O skies, with him, and let all the divine sons do obeisance to him.
Be glad, O nations, with his people, and let all the angels of God prevail for him.
For he will avenge the blood of his sons and take revenge and repay the enemies with a sentence, and he will repay those who hate, and the Lord shall cleanse the land of his people."

Scott Lawson wrote:Wouldn't we still expect a transitive with an indirect object in the dative? And can't the dative be used also for a direct object not just the accusative?

Transitive "strengthen" instances of ἐνισχύω in the LXX :
Jdg 3:12; 5:12; 16:28; 2 Kgdms 22:40; Ps 147:2; Sir 50:4; Joel 4:16; Isa 41:10; 42:6; Ezek 30:25; 34:4, 16; Dan 10:19; 11:5 all use the accusative for their direct object.
There is one possible LXX use of a dative for the direct object, in Hos 10:11. But that's because of a mistranslation when a dalet was read as a resh.

The tough thing with this verb is that the connection between the differing transitive and intransitive meanings is not readily apparent. I think the idea is that the transitive is "make someone/something strong" and the intransitive is "be/stay strong (in some circumstance)." It would be a little clearer if the intransitive sense was middle in form too.